JP2756751B2 - High pressure liquid injection work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure liquid spraying work vehicle for running a lawn or the like and spraying a liquid toward the ground, thereby perforating the ground for ventilation and water permeation, and spraying a control liquid or the like. More particularly, the present invention relates to a high-pressure liquid injection work vehicle that is advantageous for performing parallel operations such as drilling holes for ventilation and water permeability and spraying a control liquid.

[0002]

2. Description of the Related Art Turf lands such as golf courses are compacted due to a large number of golfers walking or running carts, and the soil is united, which hinders the growth of turf. For this reason, in order to loosen the soil of the turf and improve air permeability and water permeability, a high pressure liquid is continuously or intermittently jetted while running on the lawn, so that the streaks for ventilation and water permeability are applied to the turf. It has been proposed to perform aeration of grass by making holes or holes (eg, a microfilm of Japanese Utility Model Application Laid-Open No. 54-61036 and Japanese Patent Application Laid-Open No. 58-9602).

[0003] Intermittent injection of high-pressure liquid is more effective than continuous injection.
The load on the pump is reduced, and the lawn is aesthetically pleasing. In the intermittent-injection-type high-pressure liquid injection working vehicle disclosed in International Publication WO 91/07077, an accumulator and an intermittent valve are interposed between the discharge side of the pump and the nozzle to achieve sufficient pressure accumulation in the accumulator and operate the intermittent valve. The nozzle is opened and closed in synchronization with the rotation of the car tires, and high-pressure liquid is injected from the nozzle.

[0004]

[Problems to be Solved by the Invention] International Publication WO91 / 0
In the high-pressure liquid injection work vehicle disclosed in Japanese Patent No. 7077, an accumulator and an intermittent valve are interposed between the reciprocating pump and the nozzle, and the accumulator and the intermittent valve include parts that are easily corroded and worn, such as a piston and a bladder. There is no problem when injecting non-chemical and liquid containing no fine particles at high pressure,
Accumulators and intermittent valves may wear out quickly when spraying liquids containing chemicals and particulates such as control liquids and fertilizer liquids.
It corrodes and it is practically difficult to spray a control solution. Furthermore, in the high-pressure liquid injection work vehicle disclosed in International Publication WO 91/07077, the intermittent valve opens and closes in synchronization with the rotation of the tire of the high-pressure liquid injection work vehicle, so that the injection interval is fixed in the traveling direction. It is difficult to adjust the injection interval in the running direction according to the condition of the lawn.

An object of the first and second aspects of the present invention is to enable a high-pressure jet of a liquid containing chemical properties and fine particles without any trouble, and to perform not only holes for ventilation and water permeation but also operations such as control and fertilization. To provide a high-pressure liquid injection work vehicle that can be implemented by using a high-pressure liquid injection vehicle. It is an object of the present invention to provide a high-pressure liquid ejection working vehicle capable of further increasing the pulsation of each nozzle and increasing the ejection force of the liquid from the nozzle. It is an object of the present invention to provide a high-pressure liquid injection work vehicle capable of arbitrarily adjusting an injection interval in a traveling direction. A fourth object of the present invention is to provide a high-pressure liquid injection work vehicle capable of simultaneously injecting high-pressure liquid from a plurality of nozzles even when the discharge portions of the respective reciprocating pumps of the reciprocating pump device are not communicated with each other. It is.

[0006]

The present invention will be described with reference to the drawings corresponding to the embodiments. The plurality of reciprocating pumps (69) are operated in the same phase by mutually communicating the discharge portions (82).
A reciprocating pump device (48) having a hydraulic pressure transmitted from the reciprocating pump device (48), and a liquid from the reciprocating pump device (48) is transmitted in synchronization with a pulsation cycle of the hydraulic pressure. A nozzle (68) for jetting toward the ground and piercing the ground with the jet pressure.

[0007] The high pressure liquid injection work vehicle (110) according to claim 2
Is a reciprocating pump device (1) including a plurality of reciprocating pumps (205) each having a discharge section (160) that is not in communication with each other.
58), and is connected to one of the discharge units (160) to transmit the hydraulic pressure of the discharge unit (160), and to transfer the liquid from the discharge unit (160) to the ground in synchronization with the pulsation cycle of the hydraulic pressure. And a nozzle (162) that pierces the ground with the injection pressure.

[0008] The work vehicle (10, 11)
In (0), the driving speed of the reciprocating pump (69, 205) can be adjusted independently of the traveling speed of the high-pressure liquid injection working vehicle (10, 110).

In the high pressure liquid injection work vehicle (110) of the present invention, each reciprocating pump (20) of the reciprocating pump device (158) is provided.
5) is operated in phase.

In the high-pressure liquid injection work vehicle (110), the reciprocating pump (205) is driven by the hydraulic motor (1) driven by the hydraulic pressure from the variable displacement hydraulic pump (150).
52).

[0011]

According to the first aspect, the high-pressure liquid injection work vehicle (10) runs on the ground such as lawn. The discharge of the liquid (130) from each reciprocating pump (69) of the reciprocating pump device (48) to the common discharge part (82) is performed simultaneously in the same phase discharge stroke, and is stopped in the suction stroke. Thereby, the discharge unit (8
The liquid pressure of 2) pulsates and the liquid (130) of the discharge part (82)
Is guided to the nozzle (68) together with the pulsation of the hydraulic pressure. In the nozzle (68), the liquid (130) is jetted toward the ground in the high pressure range in the pulsation cycle. During the injection period, the liquid (13) injected near the peak value of the injection pressure
0) penetrates deep into the ground, whereas the liquid (130) injected in both ranges of the peak value lower than the peak value stays in a relatively shallow place near the ground.

In the second aspect, the high-pressure liquid injection work vehicle (11)
0) runs on the ground such as turf. Reciprocating pump device (15
The discharge of the liquid (130) from each reciprocating pump (205) to the discharge part (160) in 8) is performed in the discharge stroke, and is stopped in the suction stroke. Accordingly, the liquid pressure of the discharge section (160) pulsates, and the liquid (130) of the discharge section (160) is guided to the nozzle (162) together with the pulsation of the liquid pressure. In the nozzle (162), the liquid (130) is jetted toward the ground in the high pressure range in the pulsation cycle. During the injection period, the liquid (13) injected near the peak value of the injection pressure
0) penetrates deep into the ground, whereas the liquid (130) injected in both ranges of the peak value lower than the peak value stays in a relatively shallow place near the ground.

The high pressure liquid injection work vehicle according to claim 3 (10.11)
In (0), the driving speed of the reciprocating pump (69, 205) is adjusted independently of the traveling speed of the high-pressure liquid injection working vehicle (10, 110). With the change of the driving speed of the reciprocating pump (69, 205), the cycle of the suction / discharge cycle of the reciprocating pump (69, 205) changes, and the cycle of the pulsation cycle of the injection pressure in the discharge part (82, 160), and therefore, The liquid ejection interval in the traveling direction changes.

According to the high pressure liquid injection work vehicle (110) of the present invention, each reciprocating pump (20) of the reciprocating pump device (158) is provided.
5) is that each reciprocating pump (20
5) simultaneously discharges the liquid (130) to each discharge unit (160), and the pulsation cycle of the injection pressure of each discharge unit (160) also has the same phase. As a result, the liquid (130) is simultaneously ejected from each nozzle (162).

In the high pressure liquid injection work vehicle (110), the value of the generated oil pressure is adjusted in the variable displacement hydraulic pump (150), whereby the rotation speed of the hydraulic motor (152), and hence the reciprocating pump The drive speed of (205) changes. As a result, the cycle of the suction / discharge cycle of the reciprocating pump (205) also changes, the cycle of the pulsation cycle of the hydraulic pressure of the discharge section (160) changes, and the interval of the injection time of the liquid (130) at the nozzle (162) changes. Is done. When the traveling speed of the high-pressure liquid injection working vehicle (110) is equal, the injection interval in the traveling direction becomes shorter as the interval of the injection time is shorter.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a configuration diagram of a high-pressure liquid injection working vehicle 10. The high-pressure liquid injection vehicle 10 includes a high-pressure liquid injection system 12 and a hydraulic traveling system 14, and includes a high-pressure liquid injection system 12.
Is a common power source for the high-pressure liquid injection system 12 and the hydraulic traveling system 14. In the hydraulic traveling system 14, the variable displacement hydraulic pump 18 and the constant displacement hydraulic pump 20 are driven by rotational power from the engine 16 transmitted via a belt 22. The constant displacement hydraulic motor 24 is connected to the variable displacement hydraulic pump 18 via oil passages 26 and 28 to drive the drive wheels 30. Constant displacement hydraulic pump 2
0 replenishes the oil in the oil tank 32 to the oil passages 26 and 28 via the check valve 36. The relief valve 38 regulates the upper limit of the discharge pressure of the variable displacement hydraulic pump 18 and the constant displacement hydraulic pump 20. The direction control valve 40 is connected to the oil passage 26,
28 are connected and disconnected from each other, and in the connected state, the hydraulic pressure from the variable displacement hydraulic pump 18 is circulated through the directional control valve 40 without being supplied to the constant displacement hydraulic motor 24, As a result, the driving wheels 30 are stopped.

In the high-pressure liquid injection system 12, the continuously variable transmission 42 is capable of freely adjusting the reduction ratio by rotating the handle 44 by an operator.
The transmission of the rotational power transmitted from the engine 16 through the belt 50 to the dual high-pressure plunger pump device 48 via the belt 50. The chemical liquid tank 52 stores chemical liquids such as control liquid and liquid fertilizer, and communicates with a three-way valve 54 at a lower part. The water tap 58 is appropriately disposed at a predetermined point in a golf course, and has an opening / closing cock 60 on the discharge side. In general fields such as farmland, a water source such as a river is used instead of the water tap 58.
The three-way valve 54 connects the chemical solution tank 5 upstream of the strainer 56.
2 or selectively connected to the faucet 58, when performing aeration work with high-pressure water, connect the strainer 56 side to the opening and closing cock 60 side, and when performing the work of injecting the chemical into the ground, The strainer 56 is connected to the chemical tank 52. The water from the water tap 58 or the chemical in the chemical liquid tank 52 is guided to the suction side of the dual high-pressure plunger pump device 48 via the strainer 56. The dual high-pressure plunger pump device 48 is connected to a pressure regulating valve 64 on the discharge side, and the discharge pressure is adjusted to a predetermined value by the pressure regulating valve 64, as described later in FIG. The excess liquid in the pressure regulating valve 64 is returned to the suction side of the dual high pressure plunger pump device 48 via the return passage 66. The plurality of check valve-equipped injection nozzles 68 are directed downward, are arranged in a line in the horizontal direction of the high-pressure liquid injection work vehicle 10, and are connected via a common pressure-regulating valve 64 to a dual high-pressure plunger pump device 48. Is supplied with liquid.

FIG. 2 shows a double-type high-pressure plunger pump device 4.
8 is a vertical sectional view of one plunger pump 69 of FIG. The double high-pressure plunger pump device 48 has two plunger pumps 69 in the horizontal direction. The crankshaft 70 is rotated by rotational power transmitted via the belt 50 in FIG. The plunger 72 is connected to the connecting rod 7.
4, and reciprocates with the rotation of the crankshaft 70 to increase or decrease the volume of the pump chamber 76. The suction port 78 is provided at a lower portion and has a suction valve 80.
The discharge port 82 is provided at an upper portion and communicates with the pump chamber 76 via a discharge valve 84. The suction port 78 and the discharge port 82 are both plunger pumps 6.
9 are common.

FIG. 3 is a perspective view of the crankshaft 70. 1
The pair of crank arms 86 project in the same radial direction, and the crank pin 88 extends between the pair of crank arms 86. Dual-type high-pressure plunger pump device 48
Connecting rod 74 of two plunger pumps 69
Are commonly supported by the crank pins 88, and as a result, the plungers 72 of both plunger pumps 69 reciprocate in the same phase.

The operation of the high-pressure liquid injection working vehicle 10 will be described. When aeration of turf with high-pressure water is performed, the strainer 56 side of the three-way valve 54 is connected to a water tap 58.
Connect to When a chemical such as a control liquid or a liquid fertilizer is injected into the soil below the turf, the strainer 56 side of the three-way valve 54 is connected to the chemical liquid tank 52. The high-pressure liquid injection work vehicle 10 is driven by an accompanying pedestrian while driving wheels 3
0 is driven through the hydraulic traveling system 14 to travel on the lawn. The two plunger pumps 69 of the dual-type high-pressure plunger pump device 48 discharge water or a chemical solution to each discharge port 82 while operating in the same phase. Thereby, each discharge port 82 of the twin-type high-pressure plunger pump device 48 has:
A pulsation of the discharge pressure that rises in the discharge stroke of the dual high-pressure plunger pump device 48 and decreases in the suction stroke occurs,
In the discharge stroke, a sufficiently large amount of liquid is discharged from the dual high-pressure plunger pump device 48. The non-return valve-equipped injection nozzle 68 injects liquid when the discharge pressure of the dual high-pressure plunger pump device 48 is high.
When the liquid is water from the water tap 58, high-pressure water is injected into the ground, and aeration of the ground is performed. When the liquid is the control liquid and the liquid fertilizer in the chemical liquid tank 52, the control liquid and the liquid fertilizer are injected into the soil, and the control and the fertilization are performed.

When the reduction ratio of the continuously variable transmission 42 is adjusted, the rotation speed of the crankshaft 70 of the dual high-pressure plunger pump device 48 increases and decreases accordingly, and the dual high-pressure plunger pump device 48 The discharge cycle of the plunger pump 69 changes, and the dual high pressure plunger pump device 48
Of the discharge pressure generated at the discharge port 82 changes. As a result, as a result, the opening cycle of the injection nozzle 68 with the check valve changes, and the injection cycle of the high-pressure water from the injection nozzle 68 with the check valve, and accordingly, the injection interval also changes.

FIG. 5 is a schematic perspective view of the entire high-pressure liquid injection work vehicle 110. The vehicle body 112 has a frame 114 supported by a front wheel 116 and a rear wheel 118 so as to be able to run on its own. A steering wheel 1 for steering the front wheel 116 is arranged on the frame 114 in order from the front.
Driver's seat 1 equipped with a driver 22 for driving operation
20, a chemical tank 124 for storing a chemical 130 (FIG. 6) for control and fertilization, a power unit 126 equipped with an engine 134 (FIG. 6), and the like, and a high-pressure liquid injection device 128 for injecting the chemical 130 into lawn. It is arranged. High pressure liquid injection device 1
28 can be freely attached to the rear part of the vehicle body 112 in the embodiment, but may be integrated with the high-pressure liquid injection work vehicle 110.

FIG. 6 is a system diagram of the power and hydraulic pressure of the high-pressure liquid injection work vehicle 110. The steering wheel 122 of the driver's seat 120 is connected to the left and right front wheels 116 via a steering link 132 to steer the front wheels 116. The rotational power of the engine 134 is
The transmission is transmitted to the transmission 140 via a clutch 138 whose connection is controlled by a clutch pedal 136 of 0. The reduction ratio of the transmission 140 is switched by the shift lever 142 of the driver's seat 120, and the output of the transmission 140 is transmitted to the left and right rear wheels 118 via the differential gear 144. The rotational power of the engine 134 is also transmitted to the variable displacement hydraulic pump 150 of the hydraulic device 148 via the manual clutch 146. Variable displacement hydraulic pump 150
And the hydraulic motor 152 are connected to each other via oil passages 151a and 151b.
The rotation speed of the hydraulic motor 152 is adjusted by adjusting the hydraulic pressure in. The oil supply pump 154 is driven together with the variable displacement hydraulic pump 150 to appropriately supply the hydraulic medium in the oil tank 156 to the oil passages 151a and 151b.
The triple high-pressure plunger pump device 158 includes three discharge portions 160 corresponding to the plunger pumps 205 that are not in communication with each other, and is driven by the hydraulic motor 152. 3
The discharge units 160 are not in communication with each other. The nozzle row 161 is composed of a plurality of nozzles 162 arranged in a row in the left-right direction of the high-pressure liquid injection working vehicle 110. Each discharge unit 160 of the triple-type high-pressure plunger pump device 158
It is connected to each nozzle 162 via three elastic hoses 163. Triple type high pressure plunger pump device 158
Is connected to the bottom of the chemical solution tank 124 via a suction hose 166 and a common suction port.
The pressure regulating valve 164 is connected to 0. The pressure regulating valves 164 are provided corresponding to the respective discharge units 160, and guide the surplus liquid to a common part 168 common to the plurality of pressure regulating valves 164. Collecting unit 168
The excess liquid collected in the tank is returned to the chemical tank 124 via the return hose 170.

FIG. 4 is a detailed perspective view of the high-pressure liquid injection device 128. 4 and 5, the high-pressure liquid injection device 12
Numeral 8 is detachably attached to the rear part of the high-pressure liquid injection working vehicle 110. The support frame 172 (FIG. 5) is detachable at the rear end of the frame 114, and is fixed to the frame 114 in an upright state. The movable frame 174 is vertically guided by the support frame 172,
5 (FIG. 5). A pair of stays 176
Are fixed to the left and right sides of the movable frame 174 and project rearward. The base 178 is fixed to the inner surface of the stay 176 at the left and right ends, forms a horizontal plane, and has a hydraulic motor 152 and a triple high-pressure plunger pump device 158.
Is placed. The hydraulic motor 152 and the triple-type high-pressure plunger pump device 158 are mounted not on the power unit 126 but on the table 178 of the high-pressure liquid injection device 128 and are exposed to the outside. , And is useful as a synchronization mechanism and a power source of a synchronous vertical drive device 204 described later. Camshaft 180
Extends horizontally in the left-right direction, is rotatably supported at both ends by the tip of a stay 176, and transmits the rotation of the crankshaft 182 of the triple-type high-pressure plunger pump device 158 via a chain 184. The cam 186 is the camshaft 1
80 are integrally attached to both ends in the rotation direction.
The elevating shaft 188 is guided in the vertical direction by a guide 190 fixed to the tip of each stay 176, and the compression coil spring 192 is fitted to the elevating shaft 188 above the guide 190, and the elevating shaft 188 is moved upward. And the upper end of the elevating shaft 188 is kept in contact with the cam 186. The support shaft 194 extends horizontally in the left-right direction in parallel with the cam shaft 180, and both ends are fixed to the lower end of each elevating shaft 188. In each nozzle 162, the holding body 196
Is slidably fitted on the support shaft 194 and has a fixing screw 198.
To fix to the support shaft 194. The pressing plate 200 is disposed substantially horizontally below the nozzle row 161 at a height slightly below the nozzle row 161, and is fixed to the lower end of the elevating shaft 188 at both ends in the left-right direction. The long hole 202 is formed in the pressing plate 200 so as to face each nozzle 162, and extends a predetermined length in the axial direction of the support shaft 194. The synchronous vertical movement driving device 204 includes a power transmission mechanism from the crankshaft 182 to the cam 186 and a vertical movement mechanism such as the cam 186 and the elevating shaft 188. It is moved up and down in synchronization with the discharge stroke of the device 158 and thus the injection cycle of the nozzle 162.

FIG. 7 shows a triple high-pressure plunger pump device 1.
FIG. 58 is a vertical end view of the portion 58; In FIG. 7, three plunger pumps 205 of the triple high pressure plunger pump device 158 are shown.
Is representatively shown, but the structures of the other three plunger pumps 205 are the same. The crankcase 206 rotatably supports both ends of the crankshaft 182, and the manifold 208 is applied to the distal end side of the crankcase 206 and is fixed to the crankcase 206 via a plurality of bolts 210. The valve case 212 is
The triple high-pressure plunger pump device 158 has three discharge portions 160 corresponding to the three plunger pumps 205, and a pressure regulating valve 1 is provided at a portion corresponding to an upper portion of each discharge portion 160.
64 attached to the end of the manifold 208. The three flanges 214 are connected to the valve case 212.
A plurality of bolts 216
And is fixed to the bolt 216 together with the valve case 212. The plunger 218 is fitted in the guide 220 of the crankcase 206 at the base end, guided in the axial direction, and extends inside the manifold 208. Connecting rod 2
22 is a pin portion 2 of the crankshaft 182 at both ends.
23 and is connected to the base end of the plunger 218, and converts the rotation of the crankshaft 182 into reciprocating motion of the plunger 218. The oil seal 224 is fitted on the distal end side of the guide 220 and slidably contacts the peripheral portion of the plunger 218 on the inner peripheral side.
8 to prevent leakage.

FIG. 8 is a perspective view of the crankshaft 182.
The pin portion 223 of the crankshaft 182 is connected to the three plunger pumps 205 of the triple high pressure plunger pump device 158.
And extends in the row direction over the entire length of the three plunger pumps 205, and is commonly connected to each connecting rod 222 of the three plunger pumps 205. As a result, the three plunger pumps 2 of the triple high pressure plunger pump device 158
05 is operated in phase.

In FIG. 7, a pump chamber 226 is formed on the distal end side of the plunger 218, and a V packing 228 and a seal packing 230 are disposed on the distal end side and the proximal end side in the axial direction of the plunger 218, respectively. On the side, it slides against the periphery of the plunger 218, and holds the seal of the pump chamber 226 along with the reciprocation of the plunger 218. The suction port 232 is provided with a triple high pressure plunger pump device 158.
Are formed below the manifold 208 in common with the three plunger pumps 205, and each pump chamber 226 is provided via a suction valve 234 provided for each plunger pump 205.
In communication with The discharge valve 236 is provided on the distal end side of the pump chamber 226, and allows one-way liquid flow from the pump chamber 226 to the discharge unit 160.

FIG. 9 shows a triple high-pressure plunger pump device 1.
FIG. 58 is a view of one of the flanges 214 as viewed from the outside.
Three discharge ports 238 are provided on the flange 214,
Each discharge port 238 communicates with the discharge section 160 and is individually connected to each nozzle 162 via an elastic hose 163.

The operation of the high-pressure liquid injection working vehicle 110 will be described. The operator gets into the driver's seat 120 and drives the high-pressure liquid injection work vehicle 110 on grass or the like. The high-pressure liquid injection work vehicle 110 uses the rotational power of the engine 134 for the rear wheels 118.
Is transmitted to the vehicle, travels on the ground, and the front wheels 116 are steered by the operation of the steering wheel 122.
The direction of travel is controlled. On the other hand, the rotational power of the engine 134 is transmitted to the variable displacement hydraulic pump 150 of the hydraulic device 148 to drive the variable displacement hydraulic pump 150, and the generated hydraulic pressure of the variable displacement hydraulic pump 150 is changed to an oil passage 151.
a, 151b to the hydraulic motor 152,
The hydraulic motor 152 is driven.

The crankshaft 182 of the triple high-pressure plunger pump device 158 is rotated by the drive of the hydraulic motor 152, and the triple high-pressure plunger pump device 158 is connected to the chemical 130 in the chemical tank 124 through the suction hose 166.
Is discharged to each discharge unit 160. Each plunger pump 205 of the triple type high pressure plunger pump device 158
Are operated in the same phase, and the discharge units 160 are not in communication with each other, so that the pressure of each discharge unit 160 pulsates greatly. Thus, the chemical solution 130 in each ejection unit 160
Each elastic hose 1 from each discharge port 238 together with pulsating hydraulic pressure
It is sent to each nozzle 162 via 63. Elastic hose 16
Numeral 3 expands and contracts in accordance with the pulsation of the liquid pressure of the chemical solution 130 inside, and performs an accumulator function. As a result, nozzle 1
The injection pressure of 62 is maintained at a sufficiently high pressure for a while after the triple high-pressure plunger pump device 158 switches from the discharge stroke to the suction stroke while pulsating, and the injection of the chemical 130 from the nozzle 162 is continued. You. The chemical 130 injected from the nozzle 162 around the peak value of the pulsation of the injection pressure is:
It penetrates the lawn and goes deep into the ground, forming holes for ventilation and water penetration in the ground. In addition, the chemical solution 130 injected from the nozzle 162 in the injection pressure range lower than the peak value in both ranges of the peak value does not reach deep into the ground, but stays at the depth near the lawn root near the ground, and controls near the lawn root. Etc. Thus, drilling for ventilation and water permeability,
Control and the like can be carried out together.

FIGS. 10 and 11 show injection trajectory patterns generated on the lawn surface when the high-pressure liquid injection work vehicle 110 is running at high speed and at low speed, respectively. Chemical solution 1 from nozzle 162
30 is performed in synchronization with the pulsation of the hydraulic pressure of the discharge section 160, that is, the suction / discharge cycle of the triple high-pressure plunger pump device 158, and the triple high-pressure plunger pump device 1
The period of the discharge stroke of 58 is almost the injection period. With the change of the traveling speed of the high-pressure liquid injection work vehicle 110, at the time of high-speed traveling (FIG. 10), the length of each injection trajectory 240 in the traveling direction and the injection suspension length both increase, and at the time of low-speed traveling (FIG. 11).
Then, the length of the injection trajectory 240 in the traveling direction and the injection stop length are reduced. Due to the accumulator action of the elastic hose 163, the injection from the nozzle 162 is continued for a while after the triple high-pressure plunger pump device 158 is switched to the suction stroke.
Includes an extension E after time t when the triple high pressure plunger pump device 158 switches from the discharge stroke to the suction stroke. Therefore, the triple high pressure plunger pump device 1
When the rotation speed of the high-pressure liquid injection work vehicle 110 is set to a suitably low speed by increasing the rotation speed of the high-pressure liquid injection work vehicle 58, the end of the extended portion E overlaps the start of the injection trajectory 240, so that substantially continuous injection can be achieved.

The injection interval of the chemical 130 in the running direction of the high-pressure liquid injection work vehicle 110 is changed by manually changing the inclination angle of the swash plate of the variable displacement hydraulic pump 150 to generate the variable displacement hydraulic pump 150. This is performed by increasing or decreasing the oil pressure and changing the rotation speed of the hydraulic motor 152. Hydraulic motor 15
2 can be adjusted independently of the traveling speed of the high-pressure liquid injection work vehicle 110, so that the injection interval of the chemical 130 in the traveling direction of the high-pressure liquid injection work vehicle 110 is also high.
10 running speeds can be set independently.

Between the discharge section 160 and the nozzle 162,
A piston-type or bladder-type accumulator or an intermittent valve, which does not interfere with chemical resistance and abrasion resistance to fine particles contained in the chemical solution 130, are not interposed.
2 is in a directly connected state, so that high-pressure injection of not only high-pressure water but also a chemical liquid containing fine particles such as the chemical liquid 130 can be performed without any trouble.

On the other hand, in the synchronous vertical driving device 204,
The camshaft 180 rotates in synchronization with the rotation of the crankshaft 182, that is, the injection cycle of the triple high-pressure plunger pump device 158, and the cam 186 rotates in synchronization with the injection cycle of the triple high-pressure plunger pump device 158. Move up and down. The convex portion of the cam 186 becomes a downward rotation position during the discharge stroke of the triple-type high-pressure plunger pump device 158, and acts so as to push down the elevating shaft 188. As a result, the pressing plate 200 is brought into contact with the lawn in a ground state. become.
The discharge stroke of the triple high-pressure plunger pump device 158 is as follows.
Each discharge section 16 of the triple high pressure plunger pump device 158
This corresponds to a high pulsation phase range of 0, which coincides with the time when the high-pressure chemical 130 is injected from the nozzle 162 (particularly, the time range around the peak value of the injection pressure is completely included). Nozzle 1
The chemical solution 130 injected at a high pressure from 62
And is injected into the turf, forming holes in the turf for ventilation and water permeation. Further, with the injection of the chemical solution 130 into the turf, the soil near the injection point tends to rise, but the pressing plate 2
Since it is pressed from above by 00, it is prevented from rising, and the ground level before injection is maintained. Press plate 200
Also serves as a protection member for preventing the tip of the nozzle 162 from contacting the lawn. During the suction stroke of the triple high-pressure plunger pump device 158, that is, when the chemical solution 130 is not ejected from the nozzle 162, the lifting shaft 188 is raised by the compression coil spring 192, and the pressing plate 200
Leaves the lawn. Pressing plate 20 by rotation of cam 186
Since the vertical movement amount of zero is fixed and relatively small, the hydraulic cylinder 175 is expanded and contracted to move the movable frame 174 up and down appropriately with respect to the support frame 172,
Is adjusted so that the lawn is grounded with an appropriate pressing force when the high-pressure chemical solution 130 is injected from the nozzle 162.

In some cases, it is appropriate to change the injection interval of the chemical 130 in the left-right direction. In this case, each nozzle 16
2, the fixing screw 198 is loosened to make the holder 196 slidable along the support shaft 194, the interval between the nozzles 162 is changed to a desired value, and then the holder 196 is tightened again and the support shaft 194 is rotated. The position of the holding body 196 in the axial direction is fixed. Since the elongated hole 202 has a length that is appropriately long in the axial direction of the support shaft 194, the chemical 13 ejected from the nozzle 162 is changed despite the change in the interval between the nozzles 162.
Pass 0 toward the lawn without hindrance. In FIG.
02 is formed corresponding to each nozzle 162, but instead of the long hole 202, a slit extending over the entire length of the nozzle row 161 or over a plurality of nozzles 162 is formed in the pressing plate 200, and one slit is formed. Can be commonly used for the propellant liquid 130 from all or a plurality of nozzles 162.

In the high-pressure liquid injection working vehicles 10, 110, the high-pressure type double-type plunger pump device 48 and the triple-type high-pressure plunger pump device 158 are used. However, in the present invention, the number of stations of the reciprocating pump device is limited. However, a reciprocating pump other than the plunger pump 205 can be employed. Although the embodiment has been described with respect to the aeration of a turf of a golf course and the injection of a chemical solution, the high-pressure liquid injection working vehicle of the present invention is suitable for aeration and liquid injection of a turf other than a golf course, and a field such as a farmland. Can also be applied.

[0037]

According to the first and second aspects of the present invention, between the discharge part of the reciprocating pump and the nozzle, the interposition of an accumulator or an intermittent valve having a problem in chemical resistance and wear resistance is eliminated.
The liquid is ejected at a high pressure from the nozzle using the pulsation of the liquid pressure at the discharge part of the reciprocating pump. Therefore, high-pressure injection of a liquid containing chemical properties and fine particles other than water can be performed without any trouble.

According to the first and second aspects of the invention, the pulsation of the hydraulic pressure at the discharge portion of the reciprocating pump is transmitted to the nozzle, and the liquid is ejected from the nozzle in accordance with the pulsation cycle. The liquid ejected at the point reaches deep enough into the ground to make holes for ventilation and water penetration, and the liquid ejected in the low injection pressure range does not reach deep into the ground, And contribute to control and fertilization. As a result, drilling, pest control, fertilization work, and the like can be performed simultaneously, and work efficiency can be improved.

According to the second aspect of the present invention, each reciprocating pump of the reciprocating pump device has an individual discharge portion, and each discharge portion is disconnected from each other, and the nozzle is connected to any one of the discharge portions. Therefore, compared with the case where a plurality of reciprocating pumps connect the discharge sections to each other and connect each nozzle to the common discharge section, the pulsation of the injection pressure at the nozzles increases, From the liquid can be increased.

According to the third aspect of the present invention, since the driving speed of the reciprocating pump can be adjusted independently of the traveling speed of the high-pressure liquid injection work vehicle, the cycle of the pulsation cycle of the reciprocating pump, and therefore the liquid from the nozzle, Can be adjusted irrespective of the traveling speed of the high-pressure liquid injection work vehicle, and the liquid injection interval in the traveling direction of the high-pressure liquid injection work vehicle can be appropriately adjusted according to the spraying condition.

According to the fourth aspect of the present invention, since each reciprocating pump of the reciprocating pump device is operated in the same phase, the pulsation cycle of the injection pressure in each nozzle also becomes the same phase, and the liquid is simultaneously injected from a plurality of pulsation cycles. be able to.

According to the fifth aspect of the present invention, the reciprocating pump is driven by a hydraulic motor, and the driving speed of the reciprocating pump can be freely changed by increasing or decreasing the rotation speed of the hydraulic motor by adjusting the generated hydraulic pressure of the variable displacement hydraulic pump. ing. As a result, the cycle of the pulsation cycle of the reciprocating pump changes, the time interval of liquid ejection from the nozzle changes, and the interval of perforations in the running direction can be adjusted as appropriate according to the spraying condition.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a high-pressure liquid injection work vehicle.

FIG. 2 is a vertical sectional view of one high-pressure plunger pump of the high-pressure dual-type plunger pump device.

FIG. 3 is a perspective view of a crankshaft.

FIG. 4 is a detailed perspective view of the high-pressure liquid injection device.

FIG. 5 is a schematic perspective view of the entire high-pressure liquid injection working vehicle.

FIG. 6 is a system diagram of power and hydraulic pressure of the high-pressure liquid injection working vehicle.

FIG. 7 is a vertical end view of the triple high-pressure plunger pump device.

FIG. 8 is a perspective view of a crankshaft.

FIG. 9 is a view of one flange of the triple high-pressure plunger pump device as viewed from the outside.

FIG. 10 is an injection trajectory pattern generated on a lawn surface during high-speed running of the high-pressure liquid injection work vehicle.

FIG. 11 is an injection trajectory pattern generated on a lawn surface when the high-pressure liquid injection work vehicle is traveling at a low speed.

[Explanation of symbols]

10,110 High-pressure liquid injection work vehicle 48 Dual-type high-pressure plunger pump device (reciprocating pump device) 68 Injection nozzle (nozzle) with check valve 69,205 Plunger pump (reciprocating pump) 82 Discharge port (discharge unit) 130 Chemical liquid ( Liquid) 150 Variable displacement hydraulic pump 152 Hydraulic motor 158 Triple high pressure plunger pump device (reciprocating pump device) 160 Discharge unit 162 Nozzle 163 Elastic hose

Claims (5)

(57) [Claims] 1. A reciprocating pump device including a plurality pieces of reciprocating pump (69) which communicates with the discharge portion (82) to each other is operated in phase (48), the pump device (48)
The liquid pressure of the discharge portion (82) is transmitted, and the liquid from the reciprocating pump device (48) is jetted toward the ground in synchronization with the pulsation cycle of the liquid pressure, and the jet pressure is applied to the ground.
A high-pressure liquid injection working vehicle, comprising: a nozzle (68) for injecting holes . 2. A reciprocating pump device (158) comprising a plurality of reciprocating pumps (205) each having a discharge part (160) not in communication with each other, and any one of the discharge parts (160).
The hydraulic pressure of the discharge section (160) is transmitted to the discharge section (160) in synchronization with a pulsation cycle of the hydraulic pressure.
Liquid (130) ejected toward the ground from its injection
And a nozzle (162) for piercing and injecting into the ground by pressure. 3. The reciprocating pump (69, 205 ) has a drive speed adjustable independently of a running speed of the high-pressure liquid injection work vehicle (10, 110).
The high pressure liquid injection work vehicle as described. 4. The high-pressure liquid injection working vehicle according to claim 3, wherein each reciprocating pump (205) of the reciprocating pump device (158) is operated in the same phase. 5. The high-pressure liquid according to claim 3 , wherein the reciprocating pump (205) is driven by a hydraulic motor (152) driven by a hydraulic pressure from a variable displacement hydraulic pump (150). Injection work vehicle.